Datasheet

DS90LV028A
www.ti.com SNLS013E –JUNE 1998–REVISED APRIL 2013
PROBING LVDS TRANSMISSION LINES
Always use high impedance (> 100kΩ), low capacitance (< 2 pF) scope probes with a wide bandwidth (1 GHz)
scope. Improper probing will give deceiving results.
CABLES AND CONNECTORS, GENERAL COMMENTS
When choosing cable and connectors for LVDS it is important to remember:
Use controlled impedance media. The cables and connectors you use should have a matched differential
impedance of about 100Ω. They should not introduce major impedance discontinuities.
Balanced cables (e.g. twisted pair) are usually better than unbalanced cables (ribbon cable, simple coax) for
noise reduction and signal quality. Balanced cables tend to generate less EMI due to field canceling effects and
also tend to pick up electromagnetic radiation a common-mode (not differential mode) noise which is rejected by
the receiver.
For cable distances < 0.5M, most cables can be made to work effectively. For distances 0.5M ≤ d ≤ 10M, CAT 3
(category 3) twisted pair cable works well, is readily available and relatively inexpensive.
Pin Descriptions
Pin No. Name Description
1, 4 R
IN
- Inverting receiver input pin
2, 3 R
IN
+ Non-inverting receiver input pin
6, 7 R
OUT
Receiver output pin
8 V
CC
Power supply pin, +3.3V ± 0.3V
5 GND Ground pin
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